package com.ai.bitcoin.utils;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.StringUtils;

import java.security.MessageDigest;


public class MD5 {


    public static String getMD5ofStr(String s) {
        char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                'a', 'b', 'c', 'd', 'e', 'f'};
        try {
            byte[] strTemp = s.getBytes("UTF-8");
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(strTemp);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            return null;
        }

    }

    /**
     *
     * @param message
     * @return
     */
    public static String md5(String message) {
        if (StringUtils.isBlank(message)) {
            return null;
        }

        return DigestUtils.md5Hex(message);
    }

    public static void main(String[] args) {
        System.out.println(getMD5ofStr("helloworld"));
    }
}	
